CXD3003 datasheet(71/137 Pages) SONY

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CXD3003R

[3] Description of Modes

This LSI has three basic operating modes using a combination of spindle control and the PLL. The operations

for each mode are described below.

§3-1. CLV-N Mode

This mode is compatible with the CXD2510Q, and operation is the same as for conventional control (however,

variable pitch cannot be used). The PLL capture range is ±150kHz.

§3-2. CLV-W Mode

This is the wide capture range mode. This mode allows PLL to follow the rotational velocity of the disc. This

rotational following control has two types: using the built-in VCO2 or providing an external VCO. The spindle is

the same CLV servo as for the conventional series. Operation using the built-in VCO2 is described below.

(When using an external VCO, input the signal from the VPCO pin to the low-pass filter, use the output from

the low-pass filter as the control voltage for the external VCO, and input the oscillation from the VCO to the

VCKI pin.)

When starting to rotate the disc and/or speeding up to the lock range from the condition where the disc is

stopped, CAV-W mode should be used. Specifically, first send $E665X to set CAV-W mode and kick the disc,

then send $E60CX to set CLV-W mode if ALOCK is high, which can be read out serially from the SQSO pin.

CLV-W mode can be used while ALOCK is high. The microcomputer monitors the serial data output, and must

return the operation to the speed adjusting state (CAV-W mode) when ALOCK becomes low. The control flow

according to the microcomputer software in CLV-W mode is shown in Fig. 3-2.

In CLV-W mode (normal), low power consumption is achieved by setting LPWR to high. Control was formerly

performed by applying acceleration and deceleration pulses to the spindle motor. However, when LPWR is set

high, deceleration pulses are not output, thereby achieving low power consumption mode.

CLV-W mode supports control only by the ternary output of the MDP pin. Therefore, when using CLV-W mode,

set DCLV PWM MD to low.

Note) The capture range for this mode is theoretically up to the signal processing limit.

§3-3. CAV-W Mode

This is CAV mode. In this mode, the external clock is fixed and it is possible to control the spindle to the

desired rotational velocity. The rotational velocity is determined by the VP0 to 7 setting values or the external

PWM. When controlling the spindle with VP0 to 7, setting CAV-W mode with the $E665X command and

controlling VP0 to 7 with the $DX commands allows the rotational velocity to be varied from low speed to 20

speed. (See "$DX commands".) Also, when controlling the spindle with the external PWM, the PWMI pin is

binary input which becomes KICK during high intervals and BRAKE during low intervals.

The microcomputer can know the rotational velocity using V16M. The reference frequency for the velocity

measurement is a signal of 132.3kHz obtained by dividing XTAL (XTLI, XTLO) (384Fs) by 128. The velocity is

obtained by counting V16M/2 pulses while the reference is high, and the result is output from the new CPU

interface as 10 bits (VP0 to 9). These measurement results are 31 when the disc is rotating at normal speed or

127 when it is rotating at quadruple speed. These values match those of the 256 - n for control with VP0 to 7.

(See Table 2-5 and Fig. 2-6.)

In CAV-W mode, the spindle is set to the desired rotational velocity and the operation speed for the entire

system follows this rotational velocity. Therefore, the cycles for the Fs system clock, PCM data and all other

output signals from this LSI change according to the rotational velocity of the disc.

Note) The capture range for this mode is theoretically up to the signal processing limit.

Note) Set FLFC to 1 for this mode

CXD3003 Datasheet(PDF) 71 Page - Sony Corporation

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